Campbell-scientific CR800 and CR850 Measurement and Control Systems Manuel d'utilisateur Page 299

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Section 8. Operation
299
Table 64. Pulse-Input Channels and Measurements
Pulse-Input
Channel
Input Type
Data Option
CRBasic
Instruction
P1, P2
High-frequency
Low-level ac
Switch-closure
Counts
Frequency
Run average
of frequency
PulseCount()
C1, C2, C3, C4,
C5, C6, C7, C8
High-frequency
Switch-closure
Low-level ac
(with LLAC4
Low-Level AC
Conversion
Module)
Counts
Frequency
Running
average of
frequency
Interval
Period
State
PulseCount()
TimerIO()
8.1.5.1 Pulse-Input Channels (P1 - P2)
Read More! Review pulse counter specifications at CR800 Specifications.
Review pulse counter programming in CRBasic Editor Help for the PulseCount()
instruction.
Dedicated pulse-input channels (P1 through P2), as shown in figure Pulse-Input
Channels
(p. 300), can be configured to read high-frequency pulses, low-level ac
signals, or switch closures.
Note Input-channel expansion devices for all input types are available from
Campbell Scientific. Refer to Sensors and Peripherals for more information.
Caution Maximum input voltage on pulse channels P1 through P2 is ±20 V. If
pulse inputs of higher than ±20 V need to be measured, third-party external-signal
conditioners should be employed. Contact a Campbell Scientific applications
engineer if assistance is needed. Under no circumstances should voltages greater
than ±50 V be measured.
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